Dear Allan,
Thank you very much for your reply.
Yes, I work with a Samsung external drive attached, and I have done so for years. Still, it is probably that in part. I say in part because I feel like it might be connected to the battery as well, but I didn't mention it hoping that someone with more knowledge than me, could read it in the previously attached report.
When my computer crashed, it happened at around 28% of battery, both times. I also saw a symbol that I had never seen before https://mac-optimization.bestreviews.net/wp-content/uploads/sites/35/mac-low-battery-screen-icon.png
Under the battery sign, up in the menu bar I see "Service Recommended", so I was afraid it would be related to the battery health. However, it hasn't crashed again since i posted my previous message.
I bought my Macbook pro 15 in 2015, and besides heating up quite a lot, and hearing the fans going wild, the computer seems to work fine (a bit slower than at the beginning maybe). I wonder if replacing the battery for a new one would solve all problems (crashing, heating up and excessive fan's use). But at the same time, not knowing if the problems are because the computer is just old, would mean that I would be wasting the money to replace the battery. And of course, buying a new one, would cost a lot of money, and now that it seems like mac computers will be changing a lot in the next 2 years with the ARM chips... makes me feel it's a bad time to buy.
Any ideas will help. Thank you very much.